I used to work at a big national museum, and for the refurbishment of one of their biggest galleries we looked at marmoleum as an option. We got hold of some 2mX2m samples of the stuff, which we then decided against, and so they needed to be disposed of... They ended up as temporary floor coverings in my kitchen for about a year. We liked it enough to get some properly installed in the bathroom!
I wouldn't be surprised if they do high traffic versions for commercial use and then a more domestic type, but either way I don't think you'd need to really worry about taking shoes off.
The material itself is very durable, and all natural - the smell of the linseed is glorious.